The FK710-.75 Kit is specifically intended for use on Lycoming O/IO-540 engines when the B&C Oil Filter Adapter (OFA) is used in conjunction with a vacuum pump drive mounted alternator, such as the SD20. The dynafocal mount of the O/IO-540 requires the OFA to be spaced aft 1.4 so the oil filter will clear the top engine mount tube. Moving the OFA aft also requires the SD20 alternator to be moved aft 0.75. This kit includes the necessary spacer, extra-long mounting studs and gasket to make the required move.
Note: these dimensions are specific to RV-10 installations. Other O/IO-540 mounts could require slightly different spacers.